[Federal Register Volume 83, Number 112 (Monday, June 11, 2018)]
[Rules and Regulations]
[Pages 26833-26836]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2018-12285]



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 Rules and Regulations
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  Federal Register / Vol. 83, No. 112 / Monday, June 11, 2018 / Rules 
and Regulations  

[[Page 26833]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0904; Product Identifier 2017-NM-071-AD; Amendment 
39-19310; AD 2018-12-06]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: We are adopting a new airworthiness directive (AD) for certain 
The Boeing Company Model 787-8 and 787-9 airplanes. This AD was 
prompted by a report of an in-service reliability issue of a latent 
flow sensor failure combined with single cabin air compressor (CAC) 
operation. This condition resulted in reduced airflow which led to a 
persistent single CAC surge condition that caused overheat damage to 
the CAC inlet. This AD requires installing new pack control unit (PCU) 
software for the cabin air conditioning and temperature control system 
(CACTCS) and new CAC outlet pressure sensor J-tube hardware, and doing 
related investigative and corrective actions if necessary. We are 
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective July 16, 2018.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of July 16, 
2018.

ADDRESSES: For service information identified in this final rule, 
contact Boeing Commercial Airplanes, Attention: Contractual & Data 
Services (C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 
90740-5600; telephone 562-797-1717; internet https://www.myboeingfleet.com. You may view this service information at the 
FAA, Transport Standards Branch, 2200 South 216th St., Des Moines, WA. 
For information on the availability of this material at the FAA, call 
206-231-3195. It is also available on the internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2017-
0904.

Examining the AD Docket

    You may examine the AD docket on the internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2017-
0904; or in person at Docket Operations between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays. The AD docket contains 
this final rule, the regulatory evaluation, any comments received, and 
other information. The address for Docket Operations (phone: 800-647-
5527) is Docket Operations, U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE, Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Allison Buss, Aerospace Engineer, 
Cabin Safety and Environmental Systems Section, FAA, Seattle ACO 
Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-
231-3564; email: [email protected].

SUPPLEMENTARY INFORMATION:

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 by adding an AD that would apply to certain Boeing Model 787-8 
and 787-9 airplanes. The NPRM published in the Federal Register on 
October 6, 2017 (82 FR 46719). The NPRM was prompted by a report of an 
in-service reliability issue of a latent flow sensor failure combined 
with single CAC operation. This condition resulted in reduced airflow 
which led to a persistent single CAC surge condition that caused 
overheat damage to the CAC inlet. The NPRM proposed to require 
installing new PCU software for the CACTCS and new CAC outlet pressure 
sensor J-tube hardware, and doing related investigative and corrective 
actions if necessary. We are issuing this AD to prevent CAC inlet 
overheating leading to structural degradation of the CAC inlet, fumes 
in the cabin and flight deck, and interruption to in-service air 
conditioning.

Comments

    We gave the public the opportunity to participate in developing 
this final rule. The following presents the comments received on the 
NPRM and the FAA's response to each comment.

Support for the NPRM

    A commenter, Nicholas Weber, and the Air Line Pilots Association, 
International (ALPA) had no objection to the NPRM. United Airlines and 
Jetstar Airways agreed with the NPRM but submitted comments, which are 
addressed below.

Request to Reference Latest Service Information

    Boeing and Etihad Airways requested we refer to Boeing Service 
Bulletin B787-81205-SB210077-00, Issue 004, dated September 22, 2017. 
Boeing stated that the NPRM refers to Boeing Service Bulletin B787-
81205-SB210077-00, Issue 003, dated October 20, 2016, and it should be 
Issue 004 instead.
    We agree that this final rule should refer to the latest service 
information. We have reviewed Boeing Service Bulletin B787-81205-
SB210077-00, Issue 004, dated September 22, 2017, which provides minor 
corrections. We have determined the revised actions have no effect on 
airplanes on which the earlier actions were completed. We revised the 
``Related Service Information under 1 CFR part 51'' paragraph of this 
final rule to refer to Boeing Service Bulletin B787-81205-SB210077-00, 
Issue 004, dated September 22, 2017. We revised paragraphs (c)(2) and 
(g)(1) of this AD to refer to Boeing Service Bulletin B787-81205-
SB210077-00, Issue 004, dated September 22, 2017. We also added 
paragraph (h)(5) to this AD to provide credit for using Boeing Service 
Bulletin B787-81205-SB210077-00, Issue 003, dated October 20, 2016, to 
accomplish the required actions in paragraph (g) of this AD, provided 
those actions were performed before the effective date of this AD.

Request To Allow Updated Software Version

    Jetstar Airways and United Airlines requested that paragraph (g) of 
the proposed AD be updated to allow for compliance to also be met by 
installing

[[Page 26834]]

the newer PCU Y-103 (software part number (P/N) HAM56-21PC-1030) 
software per Boeing Service Bulletin B787-81205-SB210083-00, Issue 001, 
dated February 9, 2017. Jetstar Airways stated that since the release 
of Boeing Service Bulletin B787-81205-SB210075-00, Issue 003, dated 
March 29, 2017; and Boeing Service Bulletin B787-81205-SB210077-00, 
Issue 003, dated October 20, 2016; which describe procedures for 
installation of PCU Y-102 (software P/N HAM57-21PC-1020) software via 
Work Package 1, there has been new PCU Y-103 software released per 
Boeing Service Bulletin B787-81205-SB210083-00, Issue 001, dated 
February 9, 2017. Jetstar stated its understanding that Work Packages 2 
and 3 of Boeing Service Bulletin B787-81205-SB210075-00, Issue 003, 
dated March 29, 2017; or Boeing Service Bulletin B787-81205-SB210077-
00, Issue 003, dated October 20, 2016; must also be done in order to 
meet compliance with the proposed AD.
    We agree because we reviewed Boeing Service Bulletin B787-81205-
SB210083-00, Issue 001, dated February 9, 2017, and we have determined 
that compliance can be met by installing the new PCU Y-103 (software P/
N HAM56-21PC-1030) software or installing the previous PCU Y-102 
(software P/N HAM57-21PC-1020) software, provided that Work Packages 2 
and 3 of Boeing Service Bulletin B787-81205-SB210075-00, Issue 003, 
dated March 29, 2017; or Boeing Service Bulletin B787-81205-SB210077-
00, Issue 004, dated September 22, 2017; are also done. We revised the 
``Related Service Information under 1 CFR part 51'' paragraph of this 
final rule to include Boeing Service Bulletin B787-81205-SB210083-00, 
Issue 001, dated February 9, 2017. We have revised paragraphs (g)(1) 
and (g)(2) of this AD to allow Boeing Service Bulletin B787-81205-
SB210083-00, Issue 001, dated February 9, 2017, as an optional method 
of compliance for Work Package 1 of Boeing Service Bulletin B787-81205-
SB210075-00, Issue 003, dated March 29, 2017; and Boeing Service 
Bulletin B787-81205-SB210077-00, Issue 004, dated September 22, 2017.

Request To Include Required for Compliance (RC) Steps

    United Airlines observed Boeing Service Bulletin B787-81205-
SB210075-00, Issue 003, dated March 29, 2017; and Boeing Service 
Bulletin B787-81205-SB210077-00, Issue 004, dated September 22, 2017; 
do not contain steps that are designated as RC (Required for 
Compliance).
    We infer the commenter is requesting that Boeing revise the service 
information or that we clarify which steps are RC. We disagree with 
making any changes because the operators can still complete the AD 
requirements with the steps contained in the Accomplishment 
Instructions of the referenced service information. In addition, 
waiting for Boeing to change the service information would delay the 
release of the AD. Further, certain steps include aircraft maintenance 
manual (AMM) reference material. When the words ``refer to'' are used 
and the operator has an accepted alternative procedure, the accepted 
alternative procedure can be used without the need to obtain an 
alternative method of compliance (AMOC). We have not changed this AD in 
this regard.

Requests To Clarify the Discussion Section

    Boeing requested that we make several clarifications to the 
Discussion section of the NPRM. Boeing requested that the following 
changes be made to the Discussion section of the NPRM:
     Add the following statement: ``The redesigned CAC outlet 
pressure sensor J-Tube hardware is to prevent transducer fouling, which 
could compromise surge detection.'' Boeing stated the NPRM does not 
describe the purpose of the hardware change.
     In the sentence, ``Smarter Environmental Control System 
ensures that airflow is distributed equally across the CACs,'' replace 
the phrase ``Smarter Environmental Control System'' with ``the system 
controller.'' Boeing stated airflow distribution amongst CACs does not 
pertain to what they refer to as the Smarter Environmental Control 
System, and the fundamental control approach for CACs attempts to 
distribute flow equally across CACs.
     Modify the sentence ``PCU software logic was only designed 
to detect the surge when both CACs were operating on the same pack, and 
therefore, it was unable to detect a persistent single CAC surge 
condition which led to CAC inlet overheating'' to ``PCU software logic 
was only designed to react to the surge when both CACs are operating on 
the same pack, and therefore, it was unable to command a termination of 
the persistent single CAC surge condition which led to CAC inlet 
overheating.'' Boeing stated that when only a single CAC is operating 
on a pack and airflow drops to an unintended low level, the surge will 
be detected by the system controls. Boeing explained that due to a 
software requirements error, the CAC will not be shut down and the 
surge can persist. Boeing concluded that the issue is not that the 
surge is undetected but rather that the issue is that the controls fail 
to react to that surge condition.
     Modify the sentence ``In addition, we received a report of 
an in-service event involving foreign object debris in the CAC inlet 
and accumulation at the ozone converter that also led to a persistent 
single CAC surge resulting in overheat damage to the CAC inlet 
housing'' to ``In addition, we received a report of an in-service event 
involving persistent single CAC surge resulting in overheat damage to 
the CAC inlet housing and foreign object debris in the CAC inlet and 
accumulation at the ozone converter.'' Boeing stated that aspects of 
this particular event are unknown; however, it is likely the foreign 
object debris was a result of the persistent surge event.
     Modify the sentence ``The proposed PCU software change 
would redistribute the airflow to provide more flow to a single CAC, 
reducing the potential for a CAC surge'' to ``The PCU software change 
enables a single CAC in surge to be commanded off in order to prevent 
the persistent surge condition. Additionally, the software 
redistributes the airflow to provide more flow to a single CAC, 
reducing the potential for a CAC surge.'' Boeing stated the software 
changes are not ``proposed'' and already exist. Boeing also stated the 
key software feature needed for persistent surge prevention was not in 
the original sentence.
     Modify the sentence ``Reduced airflow leading to 
persistent CAC surge conditions and CAC inlet overheating, if not 
corrected, could result in structural degradation of the CAC inlet, and 
fumes in the cabin and flight deck, as well as causing interruption to 
in-service air conditioning'' to ``PCU controls that do not react to a 
single CAC in persistent CAC surge conditions leading to CAC inlet 
overheating, if not corrected, could result in structural degradation 
of the CAC inlet, and fumes in the cabin and flight deck, as well as 
causing interruption to in-service air conditioning.'' Boeing stated 
that the purpose of the redistribution of CAC airflow is to minimize 
surge occurrence and does not relate to the overall prevention of CAC 
inlet overheat.
    We agree that the changes requested by Boeing are accurate. 
However, since the text of the NPRM that Boeing referenced is not 
restated in this final rule, no change to the final rule is necessary.

Request for Credit for Previous Actions Accomplished

    Boeing and Etihad Airways requested that we include Boeing Service 
Bulletin

[[Page 26835]]

B787-81205-SB210077-00, Issue 001, dated April 19, 2016, as a method of 
compliance in the proposed AD. Boeing also requested that we include 
Boeing Service Bulletin B787-81205-SB210075-00, Issue 001, dated 
February 24, 2016. Boeing requested that the service information be 
added to paragraph (h) of the proposed AD as credit for previous 
actions. Boeing stated that not all service information revisions were 
included in paragraph (h) of the proposed AD, yet they all warrant 
credit for addressing the AD. Etihad Airways noted that incorporation 
of all revisions of Boeing Service Bulletin B787-81205-SB210075-00 
comply with the proposed AD requirements.
    We agree. We have reviewed Boeing Service Bulletin B787-81205-
SB210075-00, Issue 001, dated February 24, 2016; and Boeing Service 
Bulletin B787-81205-SB210077-00, Issue 001, dated April 19, 2016; and 
the changes made to later revisions are clarifications. We have 
determined that airplanes on which the actions specified in the earlier 
revisions were done would be compliant with this AD.
    In paragraph (h)(1) of this AD, we added Boeing Service Bulletin 
B787-81205-SB210075-00, Issue 001, dated February 24, 2016, to provide 
credit and redesignated subsequent paragraphs accordingly. We also 
added paragraph (h)(3) of this AD to add Boeing Service Bulletin B787-
81205-SB210077-00, Issue 001, dated April 19, 2016.

Conclusion

    We reviewed the relevant data, considered the comments received, 
and determined that air safety and the public interest require adopting 
this final rule with the changes described previously and minor 
editorial changes. We have determined that these minor changes:
     Are consistent with the intent that was proposed in the 
NPRM for addressing the unsafe condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM.
    We also determined that these changes will not increase the 
economic burden on any operator or increase the scope of this final 
rule.

Related Service Information Under 1 CFR Part 51

    We reviewed Boeing Service Bulletin B787-81205-SB210075-00, Issue 
003, dated March 29, 2017; and Boeing Service Bulletin B787-81205-
SB210077-00, Issue 004, dated September 22, 2017. The service 
information describes procedures for installing new PCU software for 
the CACTCS and new CAC outlet pressure sensor J-tube hardware, and 
doing related investigative and corrective actions. These documents are 
distinct since they apply to different airplane models.
    We reviewed Boeing Service Bulletin B787-81205-SB210083-00, Issue 
001, dated February 9, 2017. The service information describes 
procedures for installing new PCU software for the CACTCS to recover 
the CAC from surges by reconfiguration flow schedules.
    This service information is reasonably available because the 
interested parties have access to it through their normal course of 
business or by the means identified in the ADDRESSES section.

Costs of Compliance

    We estimate that this AD affects 62 airplanes of U.S. registry. We 
estimate the following costs to comply with this AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Software Installation.................  1 work-hour x $85 per                 $0             $85          $5,270
                                         hour = $85.
Modify Left and Right Inboard and       20 work-hours x $85 per           22,821          24,521       1,520,302
 Outboard CAC Modules.                   hour = $1,700.
----------------------------------------------------------------------------------------------------------------

    We have received no definitive data that would enable us to provide 
cost estimates for the on-condition actions specified in this AD.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. Subtitle VII: Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701: ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.
    This AD is issued in accordance with authority delegated by the 
Executive Director, Aircraft Certification Service, as authorized by 
FAA Order 8000.51C. In accordance with that order, issuance of ADs is 
normally a function of the Compliance and Airworthiness Division, but 
during this transition period, the Executive Director has delegated the 
authority to issue ADs applicable to transport category airplanes and 
associated appliances to the Director of the System Oversight Division.

Regulatory Findings

    This AD will not have federalism implications under Executive Order 
13132. This AD will not have a substantial direct effect on the States, 
on the relationship between the national government and the States, or 
on the distribution of power and responsibilities among the various 
levels of government.
    For the reasons discussed above, I certify that this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Is not a ``significant rule'' under DOT Regulatory Policies and 
Procedures (44 FR 11034, February 26, 1979),
    (3) Will not affect intrastate aviation in Alaska, and
    (4) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA amends 14 CFR part 39 as follows:

[[Page 26836]]

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13   [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive (AD):

2018-12-06 The Boeing Company: Amendment 39-19310; Docket No. FAA-
2017-0904; Product Identifier 2017-NM-071-AD.

(a) Effective Date

    This AD is effective July 16, 2018.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to The Boeing Company Model 787-8 and 787-9 
airplanes, certificated in any category, as identified in the 
applicable service information specified in paragraphs (c)(1) and 
(c)(2) of this AD.
    (1) Boeing Service Bulletin B787-81205-SB210075-00, Issue 003, 
dated March 29, 2017 (for Model 787-8 airplanes);
    (2) Boeing Service Bulletin B787-81205-SB210077-00, Issue 004, 
dated September 22, 2017 (for Model 787-9 airplanes).

(d) Subject

    Air Transport Association (ATA) of America Code 21, Air 
conditioning.

(e) Unsafe Condition

    This AD was prompted by a report of an in-service reliability 
issue involving a latent flow sensor failure combined with single 
cabin air compressor (CAC) operation. This condition resulted in 
reduced airflow which led to a persistent single CAC surge condition 
that caused overheat damage to the CAC inlet. We are issuing this AD 
to prevent CAC inlet overheating leading to structural degradation 
of the CAC inlet, fumes in the cabin and flight deck, and 
interruption to in-service air conditioning.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Software and Hardware Installation

    Within 36 months after the effective date of this AD: Install 
new pack control unit (PCU) software for the cabin air conditioning 
and temperature control system (CACTCS) and new CAC outlet pressure 
sensor J-tube hardware, and do all applicable related investigative 
and corrective actions; in accordance with the Accomplishment 
Instructions of the applicable service information specified in 
paragraph (g)(1) or (g)(2) of this AD. Related investigative and 
corrective actions must be done before further flight.
    (1) Boeing Service Bulletin B787-81205-SB210075-00, Issue 003, 
dated March 29, 2017 (for Boeing Model 787-8 airplanes); or Boeing 
Service Bulletin B787-81205-SB210077-00, Issue 004, dated September 
22, 2017 (for Boeing Model 787-9 airplanes).
    (2) Boeing Service Bulletin B787-81205-SB210083-00, Issue 001, 
dated February 9, 2017 (for all airplanes); and Work Packages 2 and 
3 of the applicable service information identified in paragraph 
(g)(1) of this AD.

(h) Credit for Previous Actions

    This paragraph provides credit for the actions specified in 
paragraph (g) of this AD, if those actions were performed before the 
effective date of this AD using the applicable service information 
specified in paragraphs (h)(1) through (h)(5) of this AD.
    (1) Boeing Service Bulletin B787-81205-SB210075-00, Issue 001, 
dated February 24, 2016 (for Model 787-8 airplanes);
    (2) Boeing Service Bulletin B787-81205-SB210075-00, Issue 002, 
dated May 11, 2016 (for Model 787-8 airplanes);
    (3) Boeing Service Bulletin B787-81205-SB210077-00, Issue 001, 
dated April 19, 2016 (for Model 787-9 airplanes);
    (4) Boeing Service Bulletin B787-81205-SB210077-00, Issue 002, 
dated May 11, 2016 (for Model 787-9 airplanes);
    (5) Boeing Service Bulletin B787-81205-SB210077-00, Issue 003, 
dated October 20, 2016 (for Model 787-9 airplanes).

(i) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Seattle ACO Branch, FAA, has the authority to 
approve AMOCs for this AD, if requested using the procedures found 
in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request 
to your principal inspector or local Flight Standards District 
Office, as appropriate. If sending information directly to the 
manager of the certification office, send it to the attention of the 
person identified in paragraph (j) of this AD. Information may be 
emailed to: [email protected].
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
district office.
    (3) An AMOC that provides an acceptable level of safety may be 
used for any repair, modification, or alteration required by this AD 
if it is approved by the Boeing Commercial Airplanes Organization 
Designation Authorization (ODA) that has been authorized by the 
Manager, Seattle ACO Branch, to make those findings. To be approved, 
the repair method, modification deviation, or alteration deviation 
must meet the certification basis of the airplane, and the approval 
must specifically refer to this AD.

(j) Related Information

    For more information about this AD, contact Allison Buss, 
Aerospace Engineer, Cabin Safety and Environmental Systems Section, 
FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; 
phone and fax: 206-231-3564; email: [email protected].

(k) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the service information listed 
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this service information as applicable to do 
the actions required by this AD, unless the AD specifies otherwise.
    (i) Boeing Service Bulletin B787-81205-SB210075-00, Issue 003, 
dated March 29, 2017;
    (ii) Boeing Service Bulletin B787-81205-SB210077-00, Issue 004, 
dated September 22, 2017;
    (iii) Boeing Service Bulletin B787-81205-SB210083-00, Issue 001, 
dated February 9, 2017.
    (3) For The Boeing Company service information identified in 
this AD, contact Boeing Commercial Airplanes, Attention: Contractual 
& Data Services (C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal 
Beach, CA 90740-5600; telephone 562-797-1717; internet https://www.myboeingfleet.com.
    (4) You may view this service information at the FAA, Transport 
Standards Branch, 2200 South 216th St., Des Moines, WA. For 
information on the availability of this material at the FAA, call 
206-231-3195.
    (5) You may view this service information that is incorporated 
by reference at the National Archives and Records Administration 
(NARA). For information on the availability of this material at 
NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued in Des Moines, Washington, on May 31, 2018.
Michael Kaszycki,
Acting Director, System Oversight Division, Aircraft Certification 
Service.
[FR Doc. 2018-12285 Filed 6-8-18; 8:45 am]
 BILLING CODE 4910-13-P